Comfortable, ergonomic design for a relaxed hand and arm: The ergonomic shape of this mouse adapts naturally to your needsSmooth thumb control: Accurately track and control the cursor on any surface with a simple thumb-controlled trackball; adjust its speed with Logitech Options softwareSuitable for tight workspaces: Since the trackball does not move, it fits into tight workspaces and busy desks, and fits neatly next to your computer and keyboardTwo ways to connect and multi-OS: Simply connect via Bluetooth or USB and never worry about drops again; with a range of up to 10m away